In Thursday's caucuses, it all comes down to getting out the vote. And Clinton is going to the extremes, even lining up baby-sitters and day care centers for caucus-going moms.

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She is locked in a tight race with Democratic rivals Barack Obama and John Edwards. Securing every extra vote in a race in which fewer than 50,000 people may show up will be the difference between a momentum-building win or a humbling defeat.

The Clinton campaign is opening day care centers across the state, including three in Des Moines, and has enlisted a legion of teenage girls to render their tyke-watching services.

"I really want to see Hillary Clinton elected, but I'm too young to caucus, so I'll baby-sit for someone else so they can," said Molly McGuire, a 14-year-old from Des Moines.

She'll watch a 2-year-old and a 6-month-old, free of charge.

Old Iowa political pros say the top three Democrats have excellent organizations, but Edwards' voters are the most likely to show up. That leaves Clinton and Obama pulling out all the stops to turn out the newcomers.

Obama Tuesday launched an army of about 500 volunteers in Des Moines.

"The only thing that counts is whether over the next 72 hours you're willing to work for this and make the phone calls, and knock on the doors and grab your friends, and grab your neighbors and say, 'It is time for us to deliver on change,'" he declared.

"It's going to come down to who gets their supporters out, and I'll put my money on my organization," Obama said later as he and Clinton campaigned across Iowa.

Obama is even using caravans of buses to bring Chicago-area students back to their Iowa colleges from winter break in time to caucus.